Video: Understanding sync

Trimming is a very powerful tool, but if you don't use it correctly, you can run into some trouble with audio and video sync. Let's take a look at what this means. So, I have a little bit more of a complex sequence. It's mostly interviews with Broll over it. And one thing about this Broll is that it's been positioned exactly over the part of the interview that it concerns. We obviously want to keep this video over the interviews. So, I'm going to go into my first edit. So, I'm going to enter a trim on this first transition.

Understanding sync

Trimming is a very powerful tool, but if you don't use it correctly, you can runinto some trouble with audio and video sync.Let's take a look at what this means.So, I have a little bit more of a complex sequence.It's mostly interviews with Broll over it.And one thing about this Broll is that it's been positioned exactly over thepart of the interview that it concerns.We obviously want to keep this video over the interviews.So, I'm going to go into my first edit.So, I'm going to enter a trim on this first transition.

I have my V1, A1, and A2 Track Selectors on, and so I'm just going to press U.And let's go ahead and play around this edit.I'll press spacebar.(Female speaker:--fined. One person follows, one person leads.)All right, so we have too much material on the A side.This is going to be an A-Side Single Roller Trim.I am going to press the P key to jump to the A side, and we want to removeframes, so I'm going to go one frame to the left using my comma. And I'm going toenable a waveform, so I can actually see the audio as I do this.

It looks like this is the offending audio, so we'll go ahead and trim to theleft by one frame at a time, and I'll release there.It looks like we just got rid of thirty-two frames on the A side.Let's go ahead and play.(Female speaker: The roles are defined. One person follows, one person leads.)Well, we've fixed that problem, but wait a second. It looks like we created a couple more.We now have this gap that we didn't have before. And I'll go ahead and do thisagain so you can see everything that happened when I did this.

I'm going to press Undo, and I'm going to do that again.Keep your eye on V2 as I do this edit.So, I'm going to trim to the left.And when I release, notice that all of my video and audio on these three tracksmoved, but nothing on V2 moved.That's going to create a problem right here and on down the line as well.Let's undo one more time, and we'll talk about how to do this correctly.

I want to trim my V2 track with these other three tracks so that everything willmove simultaneously.So, what I'm going to do is I'm going to Shift+Click on this side of the edit,up here on V2, so it's included in that trim.I'll go ahead and trim over to the left by pressing my comma again. And I'll release.Everything stayed in sync.We don't have that gap anymore.

V2 moved at the same rate as every track below it, and we're in good shape.So, bottom line: as you're trimming, make sure not to forget all of your tracksthat are involved in the trim.While it might not look like they're involved,they definitely are, because we have these points of sync that we need to maintain.So, make sure that you have the Shift+Clicking of our trim rollers as anavailable option as you go forward.

Q: When I open the exercise files, the media is all offline. I tried to reconnect using the steps in Chapter 14, but that isn't working. What do I do?

A: Make sure to watch the "Using the Exercise Files" video. The Avid MediaFiles folder must be located at the root directory of the media drive (i.e. not inside any other folders, such as the exercise files folder), or all media will be offline. Here's a summary.

1. In the lynda exercise files, there is a folder called Avid MediaFiles. Inside of that folder is a folder called MXF, and inside of the MXF folder is a folder called 1.

2. Rename the "1" folder to "2" (or any other number).

3. In a separate window, open the MXF folder of the Avid MediaFiles folder that's already on your system (not the exercise files folder). Drag the "2" folder from the exercise files to this MXF folder. You will now have both a "1" and a "2" folder. The media for this course will be in the "2" folder.

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Learn by watching, listening, and doing, Exercise files are the same files the author uses in the course, so you can download them and follow along Premium memberships include access to all exercise files in the library.

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Learn by watching, listening, and doing! Exercise files are the same files the author uses in the course, so you can download them and follow along. Exercise files are available with all Premium memberships.
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